OBSERVED VALUES OF UT1-TAI, 1962-2008
TT-UT1 can be obtained from this table using the expression
TT-UT1 = 32.184s - (UT1-TAI)
The uncertainty of UT1-TAI is smaller than 1 unit of the last digit listed.
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Date UT1-TAI Date UT1-TAI Date UT1-TAI Date UT1-TAI
(s) (s) (s) (s)
_________________________________________________________________________________
1962 JAN 1 -1.813 1974 JAN 1 -12.301 1986 JAN 1 -22.6872 1998 JAN 1 -30.7819
APR 1 -1.936 APR 1 -12.553 APR 1 -22.8157 APR 1 -30.9622
JUL 1 -2.058 JUL 1 -12.814 JUL 1 -22.9292 JUL 1 -31.1004
OCT 1 -2.142 OCT 1 -13.023 OCT 1 -23.0058 OCT 1 -31.1582
1963 JAN 1 -2.289 1975 JAN 1 -13.292 1987 JAN 1 -23.1382 1999 JAN 1 -31.2834
APR 1 -2.407 APR 1 -13.554 APR 1 -23.2788 APR 1 -31.3839
JUL 1 -2.551 JUL 1 -13.799 JUL 1 -23.3972 JUL 1 -31.4802
OCT 1 -2.659 OCT 1 -13.999 OCT 1 -23.4816 OCT 1 -31.5307
1964 JAN 1 -2.847 1976 JAN 1 -14.274 1988 JAN 1 -23.6356 2000 JAN 1 -31.6445
APR 1 -3.043 APR 1 -14.545 APR 1 -23.7823 APR 1 -31.7235
JUL 1 -3.217 JUL 1 -14.812 JUL 1 -23.9100 JUL 1 -31.7959
OCT 1 -3.350 OCT 1 -15.054 OCT 1 -23.9771 OCT 1 -31.8253
1965 JAN 1 -3.558 1977 JAN 1 -15.336 1989 JAN 1 -24.1159 2001 JAN 1 -31.9067
APR 1 -3.761 APR 1 -15.595 APR 1 -24.2443 APR 1 -31.9745
JUL 1 -3.964 JUL 1 -15.850 JUL 1 -24.3857 JUL 1 -32.0277
OCT 1 -4.139 OCT 1 -16.062 OCT 1 -24.4899 OCT 1 -32.0383
1966 JAN 1 -4.360 1978 JAN 1 -16.351 1990 JAN 1 -24.6713 2002 JAN 1 -32.1158
APR 1 -4.586 APR 1 -16.651 APR 1 -24.8631 APR 1 -32.1895
JUL 1 -4.817 JUL 1 -16.917 JUL 1 -25.0386 JUL 1 -32.2292
OCT 1 -5.006 OCT 1 -17.123 OCT 1 -25.1803 OCT 1 -32.2328
1967 JAN 1 -5.248 1979 JAN 1 -17.402 1991 JAN 1 -25.3813 2003 JAN 1 -32.2895
APR 1 -5.476 APR 1 -17.670 APR 1 -25.5871 APR 1 -32.3429
JUL 1 -5.700 JUL 1 -17.918 JUL 1 -25.7735 JUL 1 -32.3672
OCT 1 -5.871 OCT 1 -18.112 OCT 1 -25.9204 OCT 1 -32.3575
1968 JAN 1 -6.111 1980 JAN 1 -18.355 1992 JAN 1 -26.1252 2004 JAN 1 -32.3896
APR 1 -6.344 APR 1 -18.582 APR 1 -26.3562 APR 1 -32.4336
JUL 1 -6.573 JUL 1 -18.792 JUL 1 -26.5569 JUL 1 -32.4690
OCT 1 -6.775 OCT 1 -18.970 OCT 1 -26.7146 OCT 1 -32.4560
1969 JAN 1 -7.021 1981 JAN 1 -19.196 1993 JAN 1 -26.9378 2005 JAN 1 -32.5039
APR 1 -7.274 APR 1 -19.414 APR 1 -27.1734 APR 1 -32.5735
JUL 1 -7.521 JUL 1 -19.629 JUL 1 -27.4010 JUL 1 -32.6155
OCT 1 -7.734 OCT 1 -19.777 OCT 1 -27.5748 OCT 1 -32.6081
1970 JAN 1 -7.997 1982 JAN 1 -19.983 1994 JAN 1 -27.8004 2006 JAN 1 -32.6612
APR 1 -8.271 APR 1 -20.184 APR 1 -28.0202 APR 1 -32.7335
JUL 1 -8.526 JUL 1 -20.391 JUL 1 -28.2171 JUL 1 -32.8055
OCT 1 -8.722 OCT 1 -20.550 OCT 1 -28.3738 OCT 1 -32.8532
1971 JAN 1 -8.985 1983 JAN 1 -20.773 1995 JAN 1 -28.6014 2007 JAN 1 -32.9624
APR 1 -9.237 APR 1 -21.036 APR 1 -28.8437 APR 1 -33.0654
JUL 1 -9.503 JUL 1 -21.250 JUL 1 -29.0614 JUL 1 -33.1574
OCT 1 -9.741 OCT 1 -21.400 OCT 1 -29.2196 OCT 1 -33.1871
1972 JAN 1 -10.045 1984 JAN 1 -21.604 1996 JAN 1 -29.4447 2008 JAN 1 -33.2733
APR 1 -10.347 APR 1 -21.760 APR 1 -29.6292 APR 1 -33.3610
JUL 1 -10.638 JUL 1 -21.902 JUL 1 -29.8129 JUL 1 -33.4447
OCT 1 -10.888 OCT 1 -22.007 OCT 1 -29.9362 OCT 1 -33.4920
1973 JAN 1 -11.189 1985 JAN 1 -22.159 1997 JAN 1 -30.1110 2009 JAN 1 -33.5896
APR 1 -11.489 APR 1 -22.306 APR 1 -30.2914
JUL 1 -11.771 JUL 1 -22.452 JUL 1 -30.4731
OCT 1 -12.016 OCT 1 -22.533 OCT 1 -30.6086